package com.atguigu.flink.chapter07.state;

import com.atguigu.flink.bean.WaterSensor;
import com.atguigu.flink.util.AtguiguUtil;
import org.apache.flink.api.common.state.ListState;
import org.apache.flink.api.common.state.ListStateDescriptor;
import org.apache.flink.configuration.Configuration;
import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;
import org.apache.flink.streaming.api.functions.KeyedProcessFunction;
import org.apache.flink.util.Collector;

import java.util.Comparator;
import java.util.List;

/**
 * @Author lizhenchao@atguigu.cn
 * @Date 2021/9/18 15:34
 */
public class Flink05_State_Keyed_List {
    public static void main(String[] args) throws Exception {
        StreamExecutionEnvironment env = StreamExecutionEnvironment
            .getExecutionEnvironment()
            .setParallelism(3);
        env
            .socketTextStream("hadoop162", 9999)
            .map(value -> {
                String[] datas = value.split(",");
                return new WaterSensor(datas[0], Long.valueOf(datas[1]), Integer.valueOf(datas[2]));
                
            })
            .keyBy(WaterSensor::getId)
            .process(new KeyedProcessFunction<String, WaterSensor, String>() {
                
                private ListState<Integer> max3VcState;
                
                @Override
                public void open(Configuration parameters) throws Exception {
                    max3VcState = getRuntimeContext()
                        .getListState(new ListStateDescriptor<Integer>("max3VcState", Integer.class));
                }
                
                @Override
                public void processElement(WaterSensor value,
                                           Context ctx,
                                           Collector<String> out) throws Exception {
                    max3VcState.add(value.getVc());
                    
                    List<Integer> list = AtguiguUtil.toList(max3VcState.get());
                    //                    list.sort((o1, o2) -> o2.compareTo(o1));
                    list.sort(Comparator.reverseOrder());
                    if (list.size() > 3) {
                        list.remove(list.size() - 1);
                    }
                    
                    max3VcState.update(list);
                    
                    out.collect(ctx.getCurrentKey() + "  " + list.toString());
                    
                }
            })
            .print();
        
        env.execute();
        
    }
}
